Samsung introduced the S Health app with the Galaxy S4 in 2013. Since then, the app has gone through multiple iterations but one thing that was constant was the availability of the app being restricted to Galaxy Apps (formerly known as Samsung Apps).
This is now changed as the S Health app is now available on the Play Store, which seems to be compatible only with the Galaxy S6 and the Galaxy S6 edge. Hopefully, Samsung will expand the compatibility with older S Health versions as well.
S Health app allows users to track everyday activities, track steps, running activity, heart rate and more.